Method of pressing wheel naves and similar articles



K. LOHS 1,756,160

METHOD OF PRESSING WHEEL NAVES AND SIMILAR ARTICLES April 29,' 1930.

Filed Sept. 14. 1928 Fig. 4

ENTOR INV KARI. L

A T Toeflsys pressing of the article.

Patented Apr. 29, 1930 earse KARL. LOHS, or AUE-IN-SAGHSEN, GERMANYApplication filed September 14, 1928, Serial iq'o. 306,048, and in-Germany April 6, 1927. I

My invention relates to a process for pressing wheel-naves,motorcar-naves, and other similar articles made of one block at elevatedtemperatures. Such articles have been made until now of a solid block byturning and the boring and turning chips of the material very much,because the naves can be brought very nearly into the right form so thatonly very little machining need-be done on the work. In addition theclamping and centering are also facilitated and simplified by theinitial hollow pressingof the article. 7

My process makes it possible to produce short punches and comparativelysmall pressings, and in that way it is comparatively easy to take thework out of the form.

My improved process consists in piercing and pressing the article atfirst in a form of one part and then pressing it in final form in anunder socket of several parts.

The procedure is illustrated, by way of example, in its progressivesteps in the accompanying drawing, in which:

Fig. 1 shows a front elevation, partly in section, of the upperpressing-stamp for the first pressing above a vertical section throughthe under-socket with the article therein.

Fig. 2 shows a section through the undersocket and upper-socket afterthe first pressing.

Fig. 3 shows a after the first pressing.

Fig. 4 shows a front elevation, partlv in section, of the upperpressing-stamp above a vertical section through the under socketcomposed of several parts.

Fig. -5 shows a section through the undersocket and upper-socket afterthe second blank front elevation of the'article F ig; 6 shows a frontview of the finished pressed article. I

he example of the manufacture shown in the drawing illustrates theaction of press ing in the making of back wheel-naves of a bicycle.Figures 1 and 2 show the first step in theproduction ofthepartlyfinished article. The article or blankb, cut off from a rod andheated to a,white heat, is placed upon the tool W Figure 1 shows thetool or die W with the article I) set thereon and the upper stamp 0 inthe highest .position. Figure 2 shows the lower die, with the upperstamp boring is partially pressed by the two punches al and d Thepunches (Z and (Z serve for the first and partialpressing of the hollowsor recesses, the finishing pressing of' the hollows or recesses takingplace in the second step of'the process. The product of the firstpressing, the piece 70, is. shown in Figure Figures 4 and 5. show thesecond pressing. In Figure 4: the pressed piece, which is obtained inthe tool W and again heated to a white heat, is set with the pressedprojecting band a downwards on the punch (Z of the lower die Wconsisting ofseveral, for instance, segment'dike parts. The socket,whichjmay be in the form of segment-like parts 2 mounted on the die W isopened,

while the upper stamp 0 is in the highest position. Figure 5 shows thelower die with the closedsocketparts a which are forced into the closedposition by the ring f ofthe upper stampo asv well as the upper stamp 0in its lowermostposition. As the upper stamp 0 is lowered, the socketparts a are at first closed and then thepressiug of the other band it onthe pressing piece p and the final shaping of the hollow for the boringtake place. The article r isthen finished in the well known manner onthe turret-lathe with the two projecting rings or flangesa and ii andthe wholly out-pressed hollows or recesses. I

The proceeding serves naturally also for the manufacture ofpressing-pieces which have only projecting rings but no hollows or onlyone hollow or which have only hollows but no projecting rings and soforth.

Having now particularly ascertained and described the nature of myinvention and in what manner the same is to be performed, I declare thatwhat I claim is: p

1. The method of forging wheel-naves and similar articles out of asingle piece, which comprises pressing a heated, substantially solidblank in opposite directions and simultaneously forcing a portion of theflowing metal laterally of the direction of pressure, whereby an articlehaving axially opposite recesses separated by an internal web and havingan external flange is produced, and then again pressing said article andsimultaneously forcing the flowing metal laterally of the direction ofpressure along a plane spaced from said first flange.

V 2. i The method of forging wheel-naves and similar articles out of asingle piece, which comprises pressing a heated blank and forcing themetal to flow along a plane substantially at right angles to thedirection of pressure, whereby an article having an external flange isproduced and then again pressing said article and forcing the metal to,flow along a plane substantially at right angles to the direction ofpressure and spaced from said flange, whereby a second external flangeon said article is produced.

3. The method of forging wheel-naves and similar articles out of asingle piece, which comprises pressing a heated, substantially solidblank between a lower die and an upper die having an enlarged lateralrecess and forcing the metal to flow into such recess, whereby anexternal flange is formed, simultaneously forming axially oppositerecesses in said blank by forcing thereinto punches located in saiddies, whereby an article having an external flange and opposite axialrecesses and an internal web is produced, placing such article with itsflange in alower die composed of a plurality of parts and provided witha recess for receiving such flange, and pressing upon said article withan upper die provided with an enlarged lateral recess and a punch andforcing the metal to flow into said last-mentioned recess, whereby asecond external flange on said article is formed.

4. A two-stage process for the pressing of wheel bosses or like partshaving laterally projecting portions at each end, which consists insubjecting a solid blank disposed in a suitable die to the simultaneousaction of upper and lower punches whereby a cavity is produced at eachend of the blank and whereby one punch expands one end or part of theblank into a cavity or cavities of the die, and

, subsequently placing the part-formed blank in a gang or multiple-partdie and subjecting the part-formed blank to the action of further upperand lower punch elements which KARL LOHS.

